Malicious PDF — malware analysis report

Static analysis result for SHA-256 6235f2b6b17a80e7…

MALICIOUS

PDF

84.8 KB Created: 2021-09-13 16:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 707512a0e93c7c2538a8e028c5b600d5 SHA-1: b04257f61c5a2bc652f578fe0976eda87cc40175 SHA-256: 6235f2b6b17a80e7f2c987b2b53def8cc06a2a3b0681a525dd099517284b98e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://wamer.org/userfiles/file/bikivepimupidebejugi.pdf In PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/pexubajewelizolutojename.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/30882505013.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/filowutigebozujunobix.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/kiwinadutetaluvopinaj.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/31597517731.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/85544902917.pdfIn PDF document text
    • https://digicpictures.com/downloads/30611324912.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/gotezatusebu.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/65698265143.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109050105511377.pdfIn PDF document text
    • http://inphilong.com/upload/files/niwujuwibawumumu.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/mubemifedemew.pdfIn PDF document text
    • http://poliinc.com/upload/files/15562479905.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e24cbc4f73---besefedowoxaveg.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/mavonovexukawopafu.pdfIn PDF document text
    • http://slsnn.ru/content/files/foserijawunalifu.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210904043535.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/19641041067.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/wetogixigupijubem.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/majiri.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/1da29b0bf13cf8a2b0ddadc96b37b624/98863907854.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/manevapelapaxazog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+x86+hdmi+audioPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67A 10628 bytes
SHA-256: d375fa5eeb11679dc67671ca98e2d940faf756643d9eeb53f0812957fb6cb719
font_01_sfnt_off0000fe91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A3 18448 bytes
SHA-256: 68752b7a639de574cd45d8b39866344dbd37ce1ab5a9b4a86e68c3ad4ef6dec3